Despite the fact that you consider the blog post rather biased and timewise very unfortunate, what do you Eclipse MQTT experts think about the substantial critique, which seems to me very profound and detailed?

Isn’t this something, someone should reply to with a blog post? Otherwise it stands there undisputed and leaves a rather bad impression of MQTT, being an „outdated toy protocol not being useful in any serious context“ - at least that’s what I read from it.